*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19741
19751
19760
19770
19782
19791
19801
19812
19820
19832
19841
19850
19860
19870
19880
19890
19901
19910
19920
19930
19941
19952
19962
19970
19980
19990
20001
20012
20020
20030
20040
20050
20060
20070
20080
20094
20101
20111
20121
20131
20142
20150
20160
20172
20183
20190
20200
Total36